diff --git a/chrome/content/zotero/xpcom/itemTreeView.js b/chrome/content/zotero/xpcom/itemTreeView.js
index bdeb193ef..b4a677114 100644
--- a/chrome/content/zotero/xpcom/itemTreeView.js
+++ b/chrome/content/zotero/xpcom/itemTreeView.js
@@ -2032,7 +2032,7 @@ Zotero.ItemTreeView.prototype.canDrop = function(row, orient, dragData)
 		//return true;
 	}
 	
-	if (!dragData) {
+	if (!dragData || !dragData.data) {
 		var dragData = Zotero.DragDrop.getDragData(this);
 	}
 	if (!dragData) {